BCM3418
PRODUCT
®
Brief
CABLE
O F
BCM3418
B C M 3 4 1 8
CMOS
F E AT U R E S
VoIP
TUNER
B E N E F I T S
S U M M A R Y
applications
•
Supports 64 - 256 QAM
•
Input Noise Figure 12 dB
•
IP3 = 15 dBm (two tone)
•
SNR 40 dB
•
CTB, CSO, Xmod all > 50 dB
•
PLL Step Size 100 KHz
•
IF AGC 30 dB Range
•
48-Pin TQFP Package
•
.5W @ 3.3V
•
The BCM3418 supports 64- and 256-QAM digital cable
•
Low cost
•
Complete TV tuner-on-a-chip – requires no external high
frequency tuned circuits
•
Simplifies board layout
•
Single 3.3V supply
•
Eliminates microphonics
•
Differential signals for noise immunity
•
Surface-mount package simplifies manufacturing
•
Applications
• Cable Modems
• VoIP
BCM3418 Tuner Application Example (Cable Modem)
Diplex
Filter
54-860 MHz
Discrete
LNA
BCM3418
CMOS Tuner
SAW
BCM3300
QAM Rx
QPSK/QAM Tx
MCNS 1.1 MAC
SRAM
SDRAM
FLASH
PA
5-65 MHz
LPF
BCM3310
MIPS CPU
PCI I/F
Control
PCI BUS